Depends on what I’m putting in. There are some plates of leftovers that I’ve made often enough to just know how long it’ll take, so the time is exactly what it needs to be and I can wander away for a second to check the mail or whatever. Popcorn obviously comes out when it’s done. If I’m warming a drink in a mug, I’ll stop it early if the handle is at a more convenient angle, since otherwise I’m liable to burn myself.